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 TROUBLE
PROBABLE CAUSE
REMEDY
Oil leaks at either
Defective "0" rings in valve
R e p l a c e "0"
rings.
end of spool.
body.
Spring-centered
Broken springs.
Replace springs.
spools do not return
Foreign particles.
Clean system and valve
to neutral.
Misalignment of operating
Check linkage for
linkage.
binding condition.
Detent t y p e s p o o l s
Worn detent.
Replace detent.
will n o t s t a y i n
Weak or broken detent spring.
Replace detent spring.
detent position.
Relief valve not properly set,
Jo motion, slow or
Repair, clean and
or stuck in base and/or worn.
jerky action of
read just.
hydraulic system.
Dirt or foreign particles
Disassemble, clean and
lodged between relief valve
reassemble.
control poppet and seat.
Spool not moved to full stroke.
Check travel.
Small particle of dirt
No
relief
valve
plugging orifice in relief
and check hole. If
action (High
blocked, clear hole.
vaIve sub-assembly.
Pressure).
Replace valve.
Oil by-passing between spool
Load will not hold.
and body.
Repair or replace
Oil by-passing piston in
cylinder.
cvlinder.
Refer to above spool
Spool not centered.
remedies.
Disassemble, clean and
Dirt or foreign particles
Load drops when
reassemble.
lodged between check valve
spool is moved from
poppet and seat.
neutral to a power
Replace poppet.
Scored or sticking check
position.
vaIve poppet.
5-201
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